dacite vs volcanic rock

dacite and volcanic rock both are nouns.

Word	Noun	Adjective	Verb	Adverb
dacite	Yes	No	No	No
volcanic rock	Yes	No	No	No

As nouns, volcanic rock is a hypernym of dacite; that is, volcanic rock is a word with a broader meaning than dacite:

dacite: a grey volcanic rock containing plagioclase and quartz and other crystalline minerals
volcanic rock: extrusive igneous rock solidified near or on the surface of the Earth

dacite (noun)	volcanic rock (noun)
a grey volcanic rock containing plagioclase and quartz and other crystalline minerals	extrusive igneous rock solidified near or on the surface of the Earth